Mind control (also known as brainwashing, coercive persuasion, thought control, or thought reform) refers to a process in which a group or individual "systematically uses unethically manipulative methods to persuade others to conform to the wishes of the manipulator(s), often to the detriment of the person being manipulated". The term has been applied to any tactic, psychological or otherwise, which can be seen as subverting an individual's sense of control over their own thinking, behavior, emotions or decision making.

Theories of brainwashing and of mind control were originally developed to explain how totalitarian regimes appeared to succeed in systematically indoctrinating prisoners of war through propaganda and torture techniques. These theories were later expanded and modified, by psychologists including Margaret Singer, to explain a wider range of phenomena, especially conversions to new religious movements (NRMs). A third-generation theory proposed by Ben Zablocki focused on the utilization of mind control to retain members of NRMs and cults to convert them to a new religion. The suggestion that NRMs use mind control techniques has resulted in scientific and legal controversy. Neither the American Psychological Association nor the American Sociological Association have found any scientific merit in such theories.